A USB write blocker can prevent Oh shit! moment when you plug your flash drive full of your favorite security tools into a machine and watch as the machine's antivirus starts deleting your stuff. The write blocker is also useful for ensuring that a subject drive is not altered while evaluating whether or not there is anything interesting enough to create a forensic image.

The smallest USB duplicator fits inside an Altoids gum tin. It is portable enough to always have with you. A PC is not required to make forensic copies with this device.

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